Earlier, the owner of Rani Tea Estate stopped a woman from trespassing through his garden.
The incident sparked off protest from the estate labourers and locals, who assembled together to voice their protest.
Following which the tea estate owner fired at them, killing a child on the spot and injuring four others, officials said.
According to officials, the angry mob set two factories and the owner's residence on fire. They added that the mob even tried to stop the fire tenders from entering the garden.
Tension continues in the area.